study of microorganisms
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An infection is an invasion by disease-causing agents of the body tissues of an organism, their replication, and the reaction of host tissues to the infectious agents and the toxins they produce. An infectious disease is a disease arising from an infection, also known as transmissible disease or communicable disease. Infectious diseases, including bacteria, viruses, fungi, or parasites, are illnesses caused by animals. Several species exist in and on our bodies. Normally, they're harmless or even helpful. But some organisms can cause illness under certain conditions. Some infectious diseases can be transmitted from person to person. Some of them are passed on by insects or other species. And by consuming c, you can get others.
Via direct or indirect contact, infectious diseases are transmitted from person to person. All infectious diseases can be caused by certain types of viruses, bacteria, parasites, and fungi. Examples of infectious diseases are malaria, measles, and respiratory illnesses.Simple prevention steps may reduce the transmission of the disease, such as regular hand washing.